The Pareto Principle (aka paretos law) states that 80% of the results come from 20% of the effort. Italian economist Vilfredo Pareto came up with the 80 20 rule when discovering that most wealth is accrued by a minority of people (20%). I think paretos principle can be applied to health and fitness as well because at least 80% of fitness trainees aren’t reaping excellent results. I think less than 20% are, and probably closer to less than 5% in my experience with fitness trainees.